Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos campeonatos foram ganhos para o futebol de arena?
 ###Tabelas: CREATE TABLE external_links (external_links_id AUTO_INCREMENT PRIMARY KEY, SNO INT, College code VARCHAR, Faculty name VARCHAR, Designation VARCHAR, Qualification VARCHAR, Department VARCHAR, Experience VARCHAR) CREATE TABLE season-by-season (season-by-season_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Division VARCHAR, Finish VARCHAR, Wins VARCHAR, Losses VARCHAR, Pct. VARCHAR) CREATE TABLE semifinal_2 (semifinal_2_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Lane INT, Name VARCHAR, Nationality VARCHAR, Time VARCHAR) CREATE TABLE new_mexico_counties_ranked_by_per_capita_income (new_mexico_counties_ranked_by_per_capita_income_id AUTO_INCREMENT PRIMARY KEY, County VARCHAR, Per capita income VARCHAR, Median household income VARCHAR, Median family income VARCHAR, Population INT, Number of households INT) CREATE TABLE former_teams (former_teams_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Sport VARCHAR, League VARCHAR, Established INT, Began in St. Louis INT, Venue VARCHAR, Championships in St. Louis VARCHAR, Left St. Louis INT)  
SELECT Championships in St. Louis FROM former_teams WHERE Sport = Arena Football